Hammer leverage



Dec. 3, 1940. ca. emoux HAMMER LEVERAGE Filed March 18, 1940 hwcn tor a.(amour Flttormzy Patented Dec. 3, 1940 UNITED STATES PA ENT orries 4Application March 18,

2 Claims.

This invention relates to hammers and in particular to a detachabledevice the object thereof being to increase the leverage about thefulcrum point of a hammer when pulling nails and the like.

The present type of hammer rises in a relatively flat curve from theclaws to the pane of the hammer head. This is adequate for limited use,however, it is often found necessary to increase the leverage by raisingthe fulcrum point.

This situation is usually overcome by inserting a block of wood orsimilar object between the pane and the surface where the pressure isapplied, which is extremely unsatisfactory for obvious reasons.

Various attempts have been made to overcome this handicap, themostcommon being a change in the design of the head; this, limits theuse of the hammer as a mallet.

It is obvious that a successful leverage device of this nature must bedetachable otherwise it defeats the purpose of the invention. Such isthe primary object of the present device.

Another object of the invention is to provide a device that may beattached to practically all hammers and that may be sold with the hammeror as a separate unit.

Still another object of this invention is to provide a base plate forsupporting the fulcrum having means formed integral with the same forsecuring the shaft to the hammer head in the same manner that a Wedge isused at present, thus lowering the cost to the purchaser.

Further objects are to construct a dependable 35 sturdy device that willlast indefinitely and will be comparatively inexpensive. v

A still further object is to provide means whereby the fulcrum may beraised or lowered.

A still further important object of the inven- 40 tion is to enable aperson to pull nails without bending same, thereby effecting aconsiderable saving in time and money.

With these and other objects in view which may appear as the descriptionproceeds the invention consists of the novel construction andarrangement of cooperating parts as hereinafter more specifically setforth, claimed and shown in the accompanying drawing forming part ofthis application and in which:

Fig. 1 is a side elevation view of the assembled invention.

Fig. 2 is a front elevation view of the device.

Fig. 3 is a side elevation view of the base plate.

Fig. 4 is a detailed fragmentary sectional view 1940, Serial No. 324,710

showing the method of securing the fulcrum to the base plate.

Fig. 5 is a fragmentary sectional view of the fulcrum showing a modifiedform.

Referring more in detail to the drawing in which similar referencecharacters designate corresponding parts throughout the several views itwill be seen the device comprises a solid curved body hereinafterreferred to as the fulcrum ID.

The said member Ill, is cast or machined on the under surface II, toconform to the upper curve of the pane and claws of a hammer; the uppersurface l2 rises in a symmetrical curve above the claws and pane of thehammer head as best shown in Fig. 1.

The fulcrum I0, is detachably secured to the hammer head by means of thebase plate l3, which is attached thereto by the wedges l4, formedintegral with the said base plate substantially as shown. It is obviousthat a single wedge may be used and that the wedge may be positionedeither laterally of the base plate as shown or longitudinally of thesaid plate.

The fulcrum is provided with two grooves l5, positioned on either sidefrom the front surface to a predetermined distance down either side. Thesaid grooves receive inwardly projecting flanges IS on either side ofthe base plate l3 as the fulcrum is slid into operative position.

A pivotally mounted safety catch I1 is provided to hold the device inposition.

It will be noted that pressure applied on the top surface 12 of thefulcrum is received by solid parts of the device and not by therelatively weak portions at l5, l6, and I1, therefore, it will bereadily seen that there is nothing to break or strain when the device isused.

An added feature (Fig. 5) is provided whereby the crown l8, of thefulcrum may be raised by the set screw l9, to further increase theleverage. While a direct method is shown this result could beaccomplished in many ways such as by an elementary system of cogswhereby the crown could be raised from the surface I2, instead of fromthe under surface I I.

It is believed that the construction and advantages of the structureshown may be apparent from the foregoing paragraphs taken in conjunctionwith the accompanying drawing without further detailed description.

While the preferred embodiment of the invention has been disclosed it isunderstood that minor changes in the details of construction,combination and arrangement of co-operating parts may be resorted towithin the scope of latch carried by said fulcrum for locking the samein engagement with said plate.

2. A detachable fulcrum for hammers comprising a base plate detachablysecured to the end of the hammer shank on top of the hammer head, afulcrum detachably secured to said base plate having a separable crown,and a screw stud depending from said crown having threaded engagementwith an aperture through the fulcrum whereby said crown may be elevatedor lowered 10 by turning said stud.

GODFREY GIROUX.

